1 /* 2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_HPP 26 #define SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_HPP 27 28 #include "jfr/utilities/jfrTypes.hpp" 29 #include "jfr/writers/jfrMemoryWriterHost.inline.hpp" 30 31 template <typename Adapter, typename AP> // Adapter and AllocationPolicy 32 class StreamWriterHost : public MemoryWriterHost<Adapter, AP> { 33 public: 34 typedef typename Adapter::StorageType StorageType; 35 private: 36 intptr_t _stream_pos; 37 fio_fd _fd; 38 intptr_t current_stream_position() const; 39 40 protected: 41 StreamWriterHost(StorageType* storage, Thread* thread); 42 StreamWriterHost(StorageType* storage, size_t size); 43 StreamWriterHost(Thread* thread); 44 bool accommodate(size_t used, size_t requested); 45 void bytes(void* dest, const void* src, size_t len); 46 void flush(size_t size); 47 bool has_valid_fd() const; 48 49 public: 50 intptr_t current_offset() const; 51 void seek(intptr_t offset); 52 void flush(); 53 void write_unbuffered(const void* src, size_t len); 54 bool is_valid() const; 55 void close_fd(); 56 void reset(fio_fd fd); 57 }; 58 59 #endif // SHARE_VM_JFR_WRITERS_JFRSTREAMWRITERHOST_HPP 60